(p²+q)²-4p²q²=

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(p²+q)²-4p²q²=
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(p²+q)²-4p²q²=
(p²+q)²-4p²q²=

(p²+q)²-4p²q²=
(p²+q)²-4p²q²=(p²+q-2pq)p²+q+2pq)